#pragma once

#include "workspace.h"          // AppActions, UIContext
#include "rendering/view.h"

namespace Donut
{
    // the application's docking shell. draws a main menu bar and a full-viewport
    // dock space with a pass-through centre (the live 3D render shows through the
    // middle), then a set of dockable tool panels. ships a few default layouts
    // built with the DockBuilder API and lets the user rearrange, hide, or restore
    // panels like a normal desktop app. draw() returns the View the RenderPath
    // should draw this frame.
    class UILayer
    {
    public:
        UILayer() = default;
        auto draw(const UIContext& ctx) -> View;

    private:
        // which 3D view fills the pass-through centre.
        enum class Mode { Scene, Simulation };
        // a named default arrangement of the panels.
        enum class Layout { Simulation, SceneEditing, Export };

        auto draw_menu_bar(const UIContext& ctx) -> void;
        auto build_layout(unsigned int dockspace_id) -> void;   // DockBuilder tree
        auto apply_layout(Layout layout) -> void;               // preset: view + panels

        auto panel_outliner(const UIContext& ctx) -> void;
        auto panel_properties(const UIContext& ctx) -> void;
        auto panel_black_hole(const UIContext& ctx) -> void;
        auto panel_settings(const UIContext& ctx) -> void;
        auto panel_export(const UIContext& ctx) -> void;
        auto panel_stats(const UIContext& ctx) -> void;

        Mode   m_mode   = Mode::Simulation;
        Layout m_layout = Layout::Simulation;
        bool   m_rebuild_layout = false;   // rebuild the dock tree next frame
        bool   m_first_frame    = true;    // seed the default layout once, if no saved one

        // panel visibility (defaults match the Simulation layout the app opens in).
        bool m_show_outliner   = false;
        bool m_show_properties = false;
        bool m_show_black_hole = true;
        bool m_show_settings   = false;
        bool m_show_export     = false;
        bool m_show_stats      = true;

        // properties-panel gizmo op (0 = translate, 1 = scale); cast in the .cpp.
        int   m_gizmo_op = 0;

        // settings panel.
        float m_ui_scale = 1.0f;

        // export panel.
        bool m_exp_color = true, m_exp_redshift = false, m_exp_temperature = false, m_exp_impact = false;
        int  m_exp_resolution = 1, m_exp_format = 0;
        int  m_exp_written = 0; bool m_exp_reported = false;
    };
}